diff --git a/modules/quantcastBidAdapter.js b/modules/quantcastBidAdapter.js
index 739cf75c555..673a7f41c00 100644
--- a/modules/quantcastBidAdapter.js
+++ b/modules/quantcastBidAdapter.js
@@ -11,27 +11,8 @@ export const QUANTCAST_TEST_DOMAIN = 's2s-canary.quantserve.com';
 export const QUANTCAST_NET_REVENUE = true;
 export const QUANTCAST_TEST_PUBLISHER = 'test-publisher';
 export const QUANTCAST_TTL = 4;
-export const QUANTCAST_PROTOCOL =
-  window.location.protocol === 'http:'
-    ? 'http'
-    : 'https';
-export const QUANTCAST_PORT =
-  QUANTCAST_PROTOCOL === 'http'
-    ? '8080'
-    : '8443';
-
-function extractBidSizes(bid) {
-  const bidSizes = [];
-
-  bid.sizes.forEach(size => {
-    bidSizes.push({
-      width: size[0],
-      height: size[1]
-    });
-  });
-
-  return bidSizes;
-}
+export const QUANTCAST_PROTOCOL = 'https';
+export const QUANTCAST_PORT = '8443';
 
 function makeVideoImp(bid) {
   const video = {};
@@ -67,10 +48,17 @@ function makeVideoImp(bid) {
 }
 
 function makeBannerImp(bid) {
+  const sizes = bid.sizes || bid.mediaTypes.banner.sizes;
+
   return {
     banner: {
       battr: bid.params.battr,
-      sizes: extractBidSizes(bid),
+      sizes: sizes.map(size => {
+        return {
+          width: size[0],
+          height: size[1]
+        };
+      })
     },
     placementCode: bid.placementCode,
     bidFloor: bid.params.bidFloor || DEFAULT_BID_FLOOR
diff --git a/test/spec/modules/quantcastBidAdapter_spec.js b/test/spec/modules/quantcastBidAdapter_spec.js
index b553cf5d37e..b91536689db 100644
--- a/test/spec/modules/quantcastBidAdapter_spec.js
+++ b/test/spec/modules/quantcastBidAdapter_spec.js
@@ -28,7 +28,11 @@ describe('Quantcast adapter', function () {
         publisherId: QUANTCAST_TEST_PUBLISHER, // REQUIRED - Publisher ID provided by Quantcast
         battr: [1, 2] // OPTIONAL - Array of blocked creative attributes as per OpenRTB Spec List 5.3
       },
-      sizes: [[300, 250]]
+      mediaTypes: {
+        banner: {
+          sizes: [[300, 250]]
+        }
+      }
     };
 
     bidderRequest = {
@@ -83,17 +87,10 @@ describe('Quantcast adapter', function () {
   });
 
   describe('`buildRequests`', function () {
-    it('selects protocol and port', function () {
-      switch (window.location.protocol) {
-        case 'https:':
-          expect(QUANTCAST_PROTOCOL).to.equal('https');
-          expect(QUANTCAST_PORT).to.equal('8443');
-          break;
-        default:
-          expect(QUANTCAST_PROTOCOL).to.equal('http');
-          expect(QUANTCAST_PORT).to.equal('8080');
-          break;
-      }
+    it('sends secure bid requests', function () {
+      const requests = qcSpec.buildRequests([bidRequest]);
+      const url = parse(requests[0]['url']);
+      expect(url.protocol).to.equal('https');
     });
 
     it('sends bid requests to Quantcast Canary Endpoint if `publisherId` is `test-publisher`', function () {
@@ -120,30 +117,39 @@ describe('Quantcast adapter', function () {
       expect(requests[0].method).to.equal('POST');
     });
 
+    const expectedBannerBidRequest = {
+      publisherId: QUANTCAST_TEST_PUBLISHER,
+      requestId: '2f7b179d443f14',
+      imp: [
+        {
+          banner: {
+            battr: [1, 2],
+            sizes: [{ width: 300, height: 250 }]
+          },
+          placementCode: 'div-gpt-ad-1438287399331-0',
+          bidFloor: 1e-10
+        }
+      ],
+      site: {
+        page: 'http://example.com/hello.html',
+        referrer: 'http://example.com/hello.html',
+        domain: 'example.com'
+      },
+      bidId: '2f7b179d443f14',
+      gdprSignal: 0,
+      prebidJsVersion: '$prebid.version$'
+    };
+
     it('sends banner bid requests contains all the required parameters', function () {
       const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
-      const expectedBannerBidRequest = {
-        publisherId: QUANTCAST_TEST_PUBLISHER,
-        requestId: '2f7b179d443f14',
-        imp: [
-          {
-            banner: {
-              battr: [1, 2],
-              sizes: [{ width: 300, height: 250 }]
-            },
-            placementCode: 'div-gpt-ad-1438287399331-0',
-            bidFloor: 1e-10
-          }
-        ],
-        site: {
-          page: 'http://example.com/hello.html',
-          referrer: 'http://example.com/hello.html',
-          domain: 'example.com'
-        },
-        bidId: '2f7b179d443f14',
-        gdprSignal: 0,
-        prebidJsVersion: '$prebid.version$'
-      };
+
+      expect(requests[0].data).to.equal(JSON.stringify(expectedBannerBidRequest));
+    });
+
+    it('supports deprecated banner format', function () {
+      bidRequest.sizes = bidRequest.mediaTypes.banner.sizes;
+      delete bidRequest.mediaTypes;
+      const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
 
       expect(requests[0].data).to.equal(JSON.stringify(expectedBannerBidRequest));
     });
@@ -297,7 +303,6 @@ describe('Quantcast adapter', function () {
           playerSize: [[550, 310]]
         }
       };
-      bidRequest.sizes = [[300, 250], [728, 90], [250, 250], [468, 60], [320, 50]];
 
       const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
       const expectedBidRequest = {